Caspar Riga

In an earlier work I ran into the same thicket. There were dwarfs and elves and they could travel through space and time and do all sorts of magic, to the point that I, as an author, could no longer get them in trouble. Yet I found an element in the tale, which held that you could follow someone back to their time, but if you were not welcome, you could only get as close as the garden fence. In other words, magic was limitend by conventional law. Conventional? How does magic know when someone is
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